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Claude Opus 4.6 vs Gemini 3.6 Flash

Updated October 21, 2026. 87 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace Claude Opus 4.6 Replace Gemini 3.6 Flash
Claude Opus 4.6Anthropic
Coding
66.9
Overall
31.9
Output $/M
$25.00
61
Gemini 3.6 FlashGoogle
Coding
48.3
Overall
34.0
Output $/M
$3.75
26
vs boards won of 87 shared

Decision reading

Pick Claude Opus 4.6 for coding: it scores 66.9 on the Vibe Coding Index against 48.3 for Gemini 3.6 Flash.

Pick Gemini 3.6 Flash when output tokens cost 6.7x less, or when a solved task costs $1.49 against $1.56.

Model AClaude Opus 4.6Anthropic66.9/1002 independent benchmarks$1.56 per solved taskModel BGemini 3.6 FlashGoogle48.3/1001 independent benchmark$1.49 per solved task
Shared results
87
Claude Opus 4.6 only
21
Gemini 3.6 Flash only
20
Like-for-like categories
8 of 9

Shared results can support a head-to-head reading. Results only one model has describe coverage, not superiority.

Which one for your work

Each card is decided by one number both models carry. Where only one has it, the card says so and makes no call.

At a glance

Coding index
Claude Opus 4.6 66.9 from 2 benchmarks, Gemini 3.6 Flash 48.3 from 1 benchmark.
Widest category
Reasoning, 6.1 points apart on average over 14 shared benchmarks.
Widest single gap
WeirdML: Claude Opus 4.6 78.0% against Gemini 3.6 Flash 56.1%, 21.8 points apart on a 0 to 100 scale.
Output price
Claude Opus 4.6 $25.00 against Gemini 3.6 Flash $3.75 per million output tokens, 6.7x apart.
Context window
Claude Opus 4.6 takes 1M tokens, Gemini 3.6 Flash 1.05M.

Benchmark by benchmark

First the score: boards each model leads, per category, where both have a result. Then every board, a category to a fold; bars are each result on a 0 to 100 scale, so compare the two in a row, not one row with another.

Boards won, where both have a result
CategoryClaude Opus 4.6BarsGemini 3.6 FlashTies
Coding65
Intelligence11
Agentic work42
Reasoning77
Math60
Knowledge74
Web design25
General282
All shared boards6126
CodingLike-for-likeFour of these boards feed the Vibe Coding Index65
Coding benchmarks for Claude Opus 4.6 and Gemini 3.6 Flash
BenchmarkClaude Opus 4.6Gemini 3.6 FlashLeader
SWE-bench Verified75.6%Not measuredOnly Claude Opus 4.6 measured
SWE-bench Multilingual72.0%Not measuredOnly Claude Opus 4.6 measured
LMArena WebDev15471538Claude Opus 4.6
AA Coding IndexNot measured69.2Only Gemini 3.6 Flash measured
LiveCodeBench (Vals AI)84.7%88.1%Gemini 3.6 Flash
SWE-bench Verified (Vals AI)78.2%79.6%Gemini 3.6 Flash
Vibe Code Bench (Vals AI)57.6%64.0%Gemini 3.6 Flash
Code migration (Vals AI)Not measured30.9%Only Gemini 3.6 Flash measured
ProgramBench (Vals AI)Not measured0.0%Only Gemini 3.6 Flash measured
IOI (Vals AI)Not measured35.1%Only Gemini 3.6 Flash measured
Terminal-Bench 2.1 (Vals AI)Not measured73.8%Only Gemini 3.6 Flash measured
CyberBench (Vals AI)Not measured45.4%Only Gemini 3.6 Flash measured
SciCodeNot measured53.4%Only Gemini 3.6 Flash measured
Terminal-Bench Hard (Artificial Analysis run)48.5%Not measuredOnly Claude Opus 4.6 measured
Terminal-Bench79.8%Not measuredOnly Claude Opus 4.6 measured
FrontierCode26.6%34.4%Gemini 3.6 Flash
GSO-Bench41.2%Not measuredOnly Claude Opus 4.6 measured
WeirdML78.0%56.1%Claude Opus 4.6
Cybench93.0%Not measuredOnly Claude Opus 4.6 measured
ALE-BenchNot measured715.5Only Gemini 3.6 Flash measured
LMArena Text: coding15341491Claude Opus 4.6
LMArena Text: software and IT15271492Claude Opus 4.6
LMArena WebDev: React15391528Claude Opus 4.6
LMArena WebDev: HTML15591547Claude Opus 4.6
LMArena WebDev: from an image15431545Gemini 3.6 Flash
Neither model has a result on the other 13 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index11
Intelligence benchmarks for Claude Opus 4.6 and Gemini 3.6 Flash
BenchmarkClaude Opus 4.6Gemini 3.6 FlashLeader
AA Intelligence Index31.934.0Gemini 3.6 Flash
Epoch Capabilities Index155.7154.5Claude Opus 4.6
Agentic workLike-for-likePublic boards, shown as published, kept out of the index42
Agentic work benchmarks for Claude Opus 4.6 and Gemini 3.6 Flash
BenchmarkClaude Opus 4.6Gemini 3.6 FlashLeader
AA Agentic IndexNot measured29.0Only Gemini 3.6 Flash measured
Design Arena: agents building web apps12061197Claude Opus 4.6
Design Arena: agents building full-stack apps12201181Claude Opus 4.6
Design Arena: agents building mobile apps12071199Claude Opus 4.6
Design Arena: agents building Android apps12041208Gemini 3.6 Flash
Design Arena: agents building games12141181Claude Opus 4.6
Design Arena: HTML slidesNot measured1148Only Gemini 3.6 Flash measured
Design Arena: PowerPoint slidesNot measured1146Only Gemini 3.6 Flash measured
Design Arena: spreadsheetsNot measured1017Only Gemini 3.6 Flash measured
Finance Agent (Vals AI)Not measured56.3%Only Gemini 3.6 Flash measured
Tax Agent Bench (Vals AI)Not measured18.0%Only Gemini 3.6 Flash measured
Legal Research Bench (Vals AI)Not measured25.0%Only Gemini 3.6 Flash measured
Excel Modeling Benchmark (Vals AI)Not measured65.4%Only Gemini 3.6 Flash measured
BioMysteryBench (Vals AI)Not measured58.5%Only Gemini 3.6 Flash measured
Terminal-Bench-Science (Vals AI)Not measured4.3%Only Gemini 3.6 Flash measured
τ²-Bench Telecom92.1%Not measuredOnly Claude Opus 4.6 measured
APEX-Agents46.3%46.9%Gemini 3.6 Flash
METR time horizons78.9%Not measuredOnly Claude Opus 4.6 measured
Remote Labor Index4.2%Not measuredOnly Claude Opus 4.6 measured
DeepResearch Bench55.3%Not measuredOnly Claude Opus 4.6 measured
Vending-Bench 2$8,018Not measuredOnly Claude Opus 4.6 measured
Neither model has a result on the other 18 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index77
Reasoning benchmarks for Claude Opus 4.6 and Gemini 3.6 Flash
BenchmarkClaude Opus 4.6Gemini 3.6 FlashLeader
GPQA Diamond89.7%93.4%Gemini 3.6 Flash
MMMU Pro (Vals AI)83.9%88.4%Gemini 3.6 Flash
GPQA Diamond (Artificial Analysis run)89.6%92.8%Gemini 3.6 Flash
Humanity's Last Exam (Artificial Analysis run)39.9%40.8%Gemini 3.6 Flash
GPQA Diamond (Epoch AI run)90.5%94.1%Gemini 3.6 Flash
ARC-AGI94.0%91.2%Claude Opus 4.6
ARC-AGI-269.2%60.4%Claude Opus 4.6
SimpleBench67.6%Not measuredOnly Claude Opus 4.6 measured
Chess puzzles21.0%42.0%Gemini 3.6 Flash
Mystery game puzzles25.0%30.0%Gemini 3.6 Flash
EBR-bench12.7%Not measuredOnly Claude Opus 4.6 measured
LMArena Text: hard prompts15251486Claude Opus 4.6
LMArena Text: expert15441490Claude Opus 4.6
LMArena Text: hard prompts in English15301484Claude Opus 4.6
LMArena Vision: diagrams13401314Claude Opus 4.6
LMArena Vision: homework13371314Claude Opus 4.6
Neither model has a result on the other 5 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index60
Math benchmarks for Claude Opus 4.6 and Gemini 3.6 Flash
BenchmarkClaude Opus 4.6Gemini 3.6 FlashLeader
AIME95.6%Not measuredOnly Claude Opus 4.6 measured
OTIS Mock AIME94.4%94.2%Claude Opus 4.6
FrontierMath, tiers 1 to 366.0%58.9%Claude Opus 4.6
FrontierMath, tier 426.8%22.0%Claude Opus 4.6
ProofBench50.0%36.0%Claude Opus 4.6
LMArena Text: math15181508Claude Opus 4.6
LMArena Text: mathematical work15251492Claude Opus 4.6
Neither model has a result on the other 6 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index74
Knowledge benchmarks for Claude Opus 4.6 and Gemini 3.6 Flash
BenchmarkClaude Opus 4.6Gemini 3.6 FlashLeader
MMLU Pro89.1%89.3%Gemini 3.6 Flash
LegalBench (Vals AI)85.3%86.7%Gemini 3.6 Flash
CaseLaw (Vals AI)62.1%Not measuredOnly Claude Opus 4.6 measured
CorpFin (Vals AI)67.0%63.3%Claude Opus 4.6
TaxEval (Vals AI)76.0%74.9%Claude Opus 4.6
MortgageTax (Vals AI)68.5%67.6%Claude Opus 4.6
MedQA (Vals AI)95.4%Not measuredOnly Claude Opus 4.6 measured
MedCode (Vals AI)49.1%53.1%Gemini 3.6 Flash
SimpleQA Verified47.0%66.2%Gemini 3.6 Flash
LMArena Text: science15191489Claude Opus 4.6
LMArena Text: medicine and healthcare15041469Claude Opus 4.6
LMArena Text: legal and government15121479Claude Opus 4.6
LMArena Text: business and finance14971464Claude Opus 4.6
Neither model has a result on the other 4 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index25
Web design benchmarks for Claude Opus 4.6 and Gemini 3.6 Flash
BenchmarkClaude Opus 4.6Gemini 3.6 FlashLeader
Design Arena: websites12911301Gemini 3.6 Flash
Design Arena: UI components12841297Gemini 3.6 Flash
Design Arena: game dev12781263Claude Opus 4.6
Design Arena: data viz12791289Gemini 3.6 Flash
Design Arena: 3D12741272Claude Opus 4.6
Design Arena: all code categories12891290Gemini 3.6 Flash
Design Arena: SVG1227Not measuredOnly Claude Opus 4.6 measured
Design Arena: ASCII art12541281Gemini 3.6 Flash
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index282
General benchmarks for Claude Opus 4.6 and Gemini 3.6 Flash
BenchmarkClaude Opus 4.6Gemini 3.6 FlashLeader
Public Benefits Bench (Vals AI)Not measured56.6%Only Gemini 3.6 Flash measured
SAGE (Vals AI)51.6%48.7%Claude Opus 4.6
MedScribe (Vals AI)86.7%79.7%Claude Opus 4.6
Vals Multimodal IndexNot measured65.1%Only Gemini 3.6 Flash measured
IFBench53.1%Not measuredOnly Claude Opus 4.6 measured
Long context reasoning (AA-LCR)78.0%80.0%Gemini 3.6 Flash
DTBench91.2%95.5%Gemini 3.6 Flash
LMCA55.8%44.9%Claude Opus 4.6
CL-bench20.7%Not measuredOnly Claude Opus 4.6 measured
Furniture assembly28.3%23.3%Claude Opus 4.6
CL-bench Life17.0%Not measuredOnly Claude Opus 4.6 measured
LMArena Text15011480Claude Opus 4.6
LMArena Text: instruction following15211467Claude Opus 4.6
LMArena Text: creative writing15051466Claude Opus 4.6
LMArena Vision13161299Claude Opus 4.6
LMArena Text: English15111482Claude Opus 4.6
LMArena Text: non-English14881470Claude Opus 4.6
LMArena Text: Chinese15511531Claude Opus 4.6
LMArena Text: German15001480Claude Opus 4.6
LMArena Text: Japanese14881475Claude Opus 4.6
LMArena Text: Korean14641429Claude Opus 4.6
LMArena Text: French15121503Claude Opus 4.6
LMArena Text: Spanish15101476Claude Opus 4.6
LMArena Text: Russian14971488Claude Opus 4.6
LMArena Text: Polish14991473Claude Opus 4.6
LMArena Text: multi-turn15111481Claude Opus 4.6
LMArena Text: longer queries15181475Claude Opus 4.6
LMArena Text: writing and language15021470Claude Opus 4.6
LMArena Text: entertainment and media14921456Claude Opus 4.6
LMArena Vision: English13241295Claude Opus 4.6
LMArena Vision: Chinese13701357Claude Opus 4.6
LMArena Vision: reading text13261312Claude Opus 4.6
LMArena Vision: humor13141289Claude Opus 4.6
LMArena Vision: recognizing things1274Not measuredOnly Claude Opus 4.6 measured
LMArena Vision: creative writing13311278Claude Opus 4.6
LMArena Document15071456Claude Opus 4.6
Neither model has a result on the other 10 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Claude Opus 4.6 and Gemini 3.6 Flash
BenchmarkClaude Opus 4.6Gemini 3.6 FlashLeader
Neither model has a result on 5 boards here

What each workload costs

Three fixed token mixes at each model's listed price, so per-token rates become a bill.

Chat turn

1K input + 500 output tokens

Claude Opus 4.6$0.018Fits in one request
Gemini 3.6 Flash$0.0026Fits in one request

Gemini 3.6 Flash costs less

Repository review

50K input + 3K output tokens

Claude Opus 4.6$0.325Fits in one request
Gemini 3.6 Flash$0.049Fits in one request

Gemini 3.6 Flash costs less

Agent loop

200K input + 10K output tokens

Claude Opus 4.6$1.25Fits in one request
Gemini 3.6 Flash$0.188Fits in one request

Gemini 3.6 Flash costs less

Listed OpenRouter rates, without cache or batch discounts. A workload that does not fit a model's context window would need splitting.

Specification differences

The leading value in a row is marked; a row with a missing value names no leader. Our two rows are marked in red.

Specifications of Claude Opus 4.6 and Gemini 3.6 Flash
SpecificationAnthropic Claude Opus 4.6Google Gemini 3.6 Flash
MakerAnthropicGoogle
WeightsNo public weights listedNo public weights listed
ReleasedFebruary 4, 2026July 21, 2026
Context window1M1.05M
Input $/Mtok$5.00$0.75
Output $/Mtok$25.00$3.75
Coding index66.948.3
Independent measurements behind it21
Cost per solved task$1.56$1.49
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Opus 4.6 better than Gemini 3.6 Flash for coding?

Pick Claude Opus 4.6 for coding: it scores 66.9 on the Vibe Coding Index against 48.3 for Gemini 3.6 Flash. Pick Gemini 3.6 Flash when output tokens cost 6.7x less, or when a solved task costs $1.49 against $1.56.

Which is cheaper, Claude Opus 4.6 or Gemini 3.6 Flash?

Claude Opus 4.6 costs $5.00 per million input tokens and $25.00 per million output tokens; Gemini 3.6 Flash costs $0.75 and $3.75. Per solved SWE-bench Verified task, Claude Opus 4.6 costs $1.56 and Gemini 3.6 Flash $1.49.

Which has the bigger context window, Claude Opus 4.6 or Gemini 3.6 Flash?

Gemini 3.6 Flash, with 1.05M tokens against 1M.

How many benchmarks is the Claude Opus 4.6 vs Gemini 3.6 Flash comparison based on?

87 benchmarks have a result for both models as of October 21, 2026. Claude Opus 4.6's coding index rests on 2 independent benchmarks and Gemini 3.6 Flash's on 1. Where only one model has a result, the page says so instead of naming a winner.

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